For you devoted 61-plus players: yes, there are examples of success you can point to
+1: Create a token that's a copy of target creature you control, except it has haste and "At the beginning of the end step, sacrifice this token." 4: Chandra deals 8 damage divided as you choose among any number of target creatures and/or planeswalkers
Another energy ritual, Motherlode, Excavator will usually give you about four to eight energy on average, when played in the late game
Adventures in the Forgotten Realms Commander Decks - Planar Portal $149.99
That means players can still respond to the copy with spells, abilities, or more interaction
I had to really resist the urge to give a slot to Meddling Mage, while it has not been in my cube for a good while now I am very fond of the card and thought it added a lot to cube even if it wasn't optimal